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Step 5Metal Components - the roof hub
Roof Hub Options:
The whole purpose of the 'hub' is simply a way of connecting the centre of the roof all together
while also giving a centre 'vent' or 'port' for circulation/ventilation/smoke/watching the stars.
1)Traditionally it would have been a ring of saplings that the roof saplings were lashed to, but that's not something that's easy to dissassemble, and reassemble.
2)Today the most common form (I've seen it in other yurts) is a 3 layer "laminate" ring made of two layers of ply and a middle layer of wedge shaped timbers, the result being that there are squares to push the roof poles into. (the roof poles need to have an angle cut into them to use this form). I have seen this form work well and would recommend it if you have timber skills,but not metal working skills, but I did not use it myself.
3) A timber "ring" formed by building a vertical laminate up from long thin lathes of timber
which are steamed and bent into a ring, and glued and clamped together, with more lathes of timber being added into the inside of the 'ring' until it has a thick-enough profile/width.
This is lighter than 1), doesn't require the roof supports to be weakened by cutting onto an angle,
(only rounded off to fit the large holes that are then drilled into the ring laminate), and is
probably the best form to use if you ignore the construction. It's just really hard to make and
get it to work right.
4) Finally, The form I ACTUALLY used: I own a welder, and have reasonable metal working skills, so I made a 450mm (1&1/2') ring from solid metal 15mm rod (actually an ocatagon, but it looks like a circle if you don't look to closely!), and off of that I welded 8 large (15mm round) 'prongs', and 8 smaller 8mm round 'prongs' (one for each of the 16 roof supports), I arranged these so that they were angled down at the same pitch as the roof is supposed to be (whatever you worked it out to be for yout tent, I just guessed).
To join the roof timbers to this steel "star", I then VERY CAREFULLY drilled a very deep 16mm or a 9mm hole long-ways straight into the end of the roof supports/timbers. (I bought 2 spade bits(16&9mm) and a "spade bit extender" in order to drill a really deep hole.
I drilled about 200mm into the timber end for the large supports, and made the large 'prongs' 220mm long, and 100/120mm for the smaller 'prongs' ).
The idea is that the roof supports slide over the 'prongs', and produce a very strong joint. This
works really well, and I found it easy enough to make.
I made this joint up..I've never seen anyone else use this method on their yurts/plans..I just
guess no one's thought of doing it this way before...or they don't like it because it's not
"traditional" enough for them.
My 'hub' (the first yurt) is really rusted - because it was recycled steel in the first place, but the newer yurts I made were painted with zinc-impregnated (rust inhibiting) paint, which keeps them looking reasonable.
The whole purpose of the 'hub' is simply a way of connecting the centre of the roof all together
while also giving a centre 'vent' or 'port' for circulation/ventilation/smoke/watching the stars.
1)Traditionally it would have been a ring of saplings that the roof saplings were lashed to, but that's not something that's easy to dissassemble, and reassemble.
2)Today the most common form (I've seen it in other yurts) is a 3 layer "laminate" ring made of two layers of ply and a middle layer of wedge shaped timbers, the result being that there are squares to push the roof poles into. (the roof poles need to have an angle cut into them to use this form). I have seen this form work well and would recommend it if you have timber skills,but not metal working skills, but I did not use it myself.
3) A timber "ring" formed by building a vertical laminate up from long thin lathes of timber
which are steamed and bent into a ring, and glued and clamped together, with more lathes of timber being added into the inside of the 'ring' until it has a thick-enough profile/width.
This is lighter than 1), doesn't require the roof supports to be weakened by cutting onto an angle,
(only rounded off to fit the large holes that are then drilled into the ring laminate), and is
probably the best form to use if you ignore the construction. It's just really hard to make and
get it to work right.
4) Finally, The form I ACTUALLY used: I own a welder, and have reasonable metal working skills, so I made a 450mm (1&1/2') ring from solid metal 15mm rod (actually an ocatagon, but it looks like a circle if you don't look to closely!), and off of that I welded 8 large (15mm round) 'prongs', and 8 smaller 8mm round 'prongs' (one for each of the 16 roof supports), I arranged these so that they were angled down at the same pitch as the roof is supposed to be (whatever you worked it out to be for yout tent, I just guessed).
To join the roof timbers to this steel "star", I then VERY CAREFULLY drilled a very deep 16mm or a 9mm hole long-ways straight into the end of the roof supports/timbers. (I bought 2 spade bits(16&9mm) and a "spade bit extender" in order to drill a really deep hole.
I drilled about 200mm into the timber end for the large supports, and made the large 'prongs' 220mm long, and 100/120mm for the smaller 'prongs' ).
The idea is that the roof supports slide over the 'prongs', and produce a very strong joint. This
works really well, and I found it easy enough to make.
I made this joint up..I've never seen anyone else use this method on their yurts/plans..I just
guess no one's thought of doing it this way before...or they don't like it because it's not
"traditional" enough for them.
My 'hub' (the first yurt) is really rusted - because it was recycled steel in the first place, but the newer yurts I made were painted with zinc-impregnated (rust inhibiting) paint, which keeps them looking reasonable.
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